refactor and add cases updated indicator
Merge branch 'master' into caseupdates

Conflicts:
	corehq/apps/callcenter/indicator_sets.py
matchers no longer required
Merge pull request #789 from dimagi/caseupdates

call-center - refactor and add cases updated indicator
Merge branch 'master' of github.com:/dimagi/commcare-hq into vellum-cleanup